硫酸钠对细粒辉钼矿表面氧化−溶解行为的影响

颜煜恩; 王宇斌; 吴忠意; 雷大士; 彭祥玉

doi:10.13779/j.cnki.issn1001-0076.2024.08.027

硫酸钠对细粒辉钼矿表面氧化−溶解行为的影响

西安建筑科技大学资源工程学院，陕西西安 710055

基金项目: 陕西省科技厅青年基金项目（2024JC−YBQN−0389）

详细信息

作者简介: 颜煜恩（2000—），女，湖北孝感人，硕士研究生，研究方向为资源综合利用，E-mail：yhk19250@163.com

通讯作者: 彭祥玉（1992—），女，新疆伊宁人，博士，讲师，主要从事矿物的分离及资源综合利用等方面的研究工作，E-mail：pengxiangyu@xauat.edu.cn。

中图分类号: TD923

收稿日期: 2024-03-11

刊出日期: 2025-02-15

Effect of Sodium Sulfate on Surface Oxidation−dissolution Behavior of Fine−grained Molybdenite and Its Mechanism

School of Resource Engineering, Xi 'an University of Architecture and Technology, Xi 'an 710055, Shaanxi, China

More Information

Corresponding author: PENG Xiangyu, pengxiangyu@xauat.edu.cn

Received Date: 11 March 2024

Publish Date: 15 February 2025

摘要

摘要:
细粒辉钼矿表面的过度氧化以及表面氧化产物的溶解行为不利于辉钼矿浮选，为此，研究采用硫酸钠减小细粒辉钼矿表面氧化的程度以及抑制表面氧化产物的溶解以期改善辉钼矿的浮选效果。结果表明，适量的硫酸钠可减小细粒辉钼矿表面Mo−O键的相对含量，对细粒辉钼矿氧化反应及氧化产物的溶解过程具有一定的调控作用。0.08 mol/L的硫酸钠可使矿浆中矿物溶解的硫酸根离子质量浓度减小68.25%，溶解氧质量浓度减小25.81%，并使细粒辉钼矿（100）晶面的晶面间距减小，而结晶度增大。其次，硫酸钠在溶液中电离出的硫酸根离子对辉钼矿表面硫元素氧化产物的溶解反应产生同离子效应，使氧化产物溶解受阻，提高了细粒辉钼矿表面性质的均匀性和可浮性。研究对细粒辉钼矿氧化−溶解过程的调控及其浮选效果的提高具有一定的指导意义。
- 氧化 /
- 溶解 /
- 同离子效应 /
- 晶面间距 /
- 细粒辉钼矿
Abstract:
The excessive oxidation on the surface of micro−fine molybdenite and the dissolution behavior of the surface oxidation products are not favorable for molybdenite flotation, for this reason, sodium sulfate was used to reduce the degree of surface oxidation of fine−grained molybdenite and inhibit the dissolution of surface oxidation products in order to improve the flotation efficiency of molybdenite. The results indicated that the appropriate amount of sodium sulfate could reduce relative content of Mo−O bonds on the surface of micro−fine molybdenite, which had a certain regulatory effect on the oxidation reaction of micro−fine molybdenite and the dissolution process of oxidation products. Sodium sulfate at 0.08 mol/L reduced the sulfate ion concentration in the slurry by 68.25% and the dissolved oxygen concentration by 25.81%, and reduced the crystalline spacing of the micro−fine molybdenite (100) crystal faces, while increasing the crystallinity. Secondly, the sulfate ions ionized by sodium sulfate in solution produce a common ion effect on the dissolution reaction of sulfur oxidation products on the surface of molybdenite, which hindered the dissolution of oxidation products and improved the uniformity and floatability of fine−grained molybdenite surface properties. The study has certain guiding significance for the regulation of the oxidation−dissolution process of micro−fine molybdenite and its flotation effects improvement.
- oxidative /
- dissolution /
- common ion effect /
- crystal−plane distance /
- micro−fine molybdenite

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图 1 辉钼矿单矿物XRD图谱

Figure 1.

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图 2 辉钼矿氧化−溶解实验流程

Figure 2.

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图 3 浓度为0 mol/L（a）和0.02 mol/L（b）硫酸钠体系下细粒辉钼矿的氧化−溶解反应热

Figure 3.

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图 4 硫酸钠浓度对硫酸根离子浓度（a）、溶解氧浓度（b）以及矿浆pH值（c）的影响

Figure 4.

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图 5 不同硫酸钠浓度下细粒辉钼矿氧化−溶解后样品的SEM照片

Figure 5.

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图 6 细粒辉钼矿晶面元素及相对含量

Figure 6.

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图 7 不同硫酸钠浓度体系下细粒辉钼矿XRD图谱

Figure 7.

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图 8 硫酸钠浓度对细粒辉钼矿（100）晶面间距（a）和结晶度（b）的影响

Figure 8.

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图 9 不同硫酸钠浓度体系下经氧化溶解后粒辉钼矿的XPS全谱

Figure 9.

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图 10 不同硫酸钠浓度的细粒辉钼矿氧化溶解表面钼元素的分峰拟合

Figure 10.

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表 1 细粒辉钼矿表面Mo（3d_3/2）的价健形态及分布

Table 1. Valence form and distribution of Mo (3d_3/2) on fine molybdenite surface

Na₂SO₄浓度/(mol·L⁻¹)	峰面积		峰面积比/%
Na₂SO₄浓度/(mol·L⁻¹)	Mo−S (3d_3/2)	Mo−O (3d_3/2)	Mo−S (3d_3/2)	Mo−O (3d_3/2)
0	5022.94	4862.13	50.81	49.19
0.02	55812.75	36676.12	60.35	39.65
0.04	23730.52	14496.75	62.08	37.92
0.06	57141.94	31079.40	64.77	35.23
0.08	39849.72	17225.21	59.82	30.18
0.10	16792.50	17423.97	79.34	20.66

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